Posted: 18/07/2015 at 06:20
Depends on how much it slopes, and in which direction.
If there's a slight slope along the length of the allotment, and you grow in rows across the slope, it will work like terracing and won't be a problem.
However if you grow in rows along the direction of the slope that may be more of a problem.
Presumably yours isn't the only allotment with a slope on the site - how do other allotmenteers manage theirs?